CVE-2026-55193

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.27.0, FreeRDP clients using TS Gateway accept a server-controlled max_xmit_frag value in libfreerdp/core/gateway/rpc_bind.c without bounding it to the 4088-byte ReceiveFragment allocation. A malicious gateway can advertise 65535 and then send a response fragment of the same length, causing rpc_channel_read in libfreerdp/core/gateway/rpc.c to write up to 65535 bytes into the smaller ReceiveFragment buffer. This can crash the client and may permit code execution through attacker-controlled heap corruption. This issue is fixed in version 3.27.0.

• CWE-122

• https://github.com/FreeRDP/FreeRDP/commit/a863ef1cf1cdabf9019280e5658f806e73bb50e8Patch
• https://github.com/FreeRDP/FreeRDP/pull/12873Issue Tracking, Patch
• https://github.com/FreeRDP/FreeRDP/releases/tag/3.27.0Release Notes
• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-7rp4-66mc-j9vxExploit, Vendor Advisory

Published

Aug 19, 2026

Last Modified

Oct 26, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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